// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* https://www.huawei.com/
* Copyright (C) 2021, Alibaba Cloud
*/
#include "xattr.h"
#include <trace/events/erofs.h>
static int erofs_fill_symlink(struct inode *inode, void *kaddr,
unsigned int m_pofs)
{
struct erofs_inode *vi = EROFS_I(inode);
loff_t off;
m_pofs += vi->xattr_isize;
/* check if it cannot be handled with fast symlink scheme */
if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
check_add_overflow(m_pofs, inode->i_size, &off) ||
off > i_blocksize(inode))
return 0;
inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL);
return inode->i_link ? 0 : -ENOMEM;
}
static int erofs_read_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct erofs_inode *vi = EROFS_I(inode);
const erofs_off_t inode_loc = erofs_iloc(inode);
erofs_blk_t blkaddr, nblks = 0;
void *kaddr;
struct erofs_inode_compact *dic;
struct erofs_inode_extended *die, *copied = NULL;
union erofs_inode_i_u iu;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
unsigned int ifmt, ofs;
int err = 0;
blkaddr = erofs_blknr(sb, inode_loc);
ofs = erofs_blkoff(sb, inode_loc);
kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), EROFS_KMAP);
if (IS_ERR(kaddr)) {
erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
vi->nid, PTR_ERR(kaddr));
return PTR_ERR(kaddr);
}
dic = kaddr + ofs;
ifmt = le16_to_cpu(dic->i_format);
if (ifmt & ~EROFS_I_ALL) {
erofs_err(sb, "unsupported i_format %u of nid %llu",
ifmt, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
vi->datalayout = erofs_inode_datalayout(ifmt);
if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
erofs_err(sb, "unsupported datalayout %u of nid %llu",
vi->datalayout, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
switch (erofs_inode_version(ifmt)) {
case EROFS_INODE_LAYOUT_EXTENDED:
vi->inode_isize = sizeof(struct erofs_inode_extended);
/* check if the extended inode acrosses block boundary */
if (ofs + vi->inode_isize <= sb->s_blocksize) {
ofs += vi->inode_isize;
die = (struct erofs_inode_extended *)dic;
} else {
const unsigned int gotten = sb->s_blocksize - ofs;
copied = kmalloc(vi->inode_isize, GFP_KERNEL);
if (!copied) {
err = -ENOMEM;
goto err_out;
}
memcpy(copied, dic, gotten);
kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr + 1),
EROFS_KMAP);
if (IS_ERR(kaddr)) {
erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
vi->nid, PTR_ERR(kaddr));
kfree(copied);
return PTR_ERR(kaddr);
}
ofs = vi->inode_isize - gotten;
memcpy((u8 *)copied + gotten, kaddr, ofs);
die = copied;
}
vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
inode->i_mode = le16_to_cpu(die->i_mode);
iu = die->i_u;
i_uid_write(inode, le32_to_cpu(die->i_uid));
i_gid_write(inode, le32_to_cpu(die->i_gid));
set_nlink(inode, le32_to_cpu(die->i_nlink));
/* each extended inode has its own timestamp */
inode_set_ctime(inode, le64_to_cpu(die->i_mtime),
le32_to_cpu(die->i_mtime_nsec));
inode->i_size = le64_to_cpu(die->i_size);
kfree(copied);
break;
case EROFS_INODE_LAYOUT_COMPACT:
vi->inode_isize = sizeof(struct erofs_inode_compact);
ofs += vi->inode_isize;
vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
inode->i_mode = le16_to_cpu(dic->i_mode);
iu = dic->i_u;
i_uid_write(inode, le16_to_cpu(dic->i_uid));
i_gid_write(inode, le16_to_cpu(dic->i_gid));
set_nlink(inode, le16_to_cpu(dic->i_nlink));
/* use build time for compact inodes */
inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec);
inode->i_size = le32_to_cpu(dic->i_size);
break;
default:
erofs_err(sb, "unsupported on-disk inode version %u of nid %llu",
erofs_inode_version(ifmt), vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
if (unlikely(inode->i_size < 0)) {
erofs_err(sb, "negative i_size @ nid %llu", vi->nid);
err = -EFSCORRUPTED;
goto err_out;
}
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
case S_IFDIR:
case S_IFLNK:
vi->raw_blkaddr = le32_to_cpu(iu.raw_blkaddr);
if(S_ISLNK(inode->i_mode)) {
err = erofs_fill_symlink(inode, kaddr, ofs);
if (err)
goto err_out;
}
break;
case S_IFCHR:
case S_IFBLK:
inode->i_rdev = new_decode_dev(le32_to_cpu(iu.rdev));
break;
case S_IFIFO:
case S_IFSOCK:
inode->i_rdev = 0;
break;
default:
erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode,
vi->nid);
err = -EFSCORRUPTED;
goto err_out;
}
/* total blocks for compressed files */
if (erofs_inode_is_data_compressed(vi->datalayout)) {
nblks = le32_to_cpu(iu.compressed_blocks);
} else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
/* fill chunked inode summary info */
vi->chunkformat = le16_to_cpu(iu.c.format);
if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
erofs_err(sb, "unsupported chunk format %x of nid %llu",
vi->chunkformat, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
vi->chunkbits = sb->s_blocksize_bits +
(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
}
inode_set_mtime_to_ts(inode,
inode_set_atime_to_ts(inode, inode_get_ctime(inode)));
inode->i_flags &= ~S_DAX;
if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
(vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
vi->datalayout == EROFS_INODE_CHUNK_BASED))
inode->i_flags |= S_DAX;
if (!nblks)
/* measure inode.i_blocks as generic filesystems */
inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9;
else
inode->i_blocks = nblks << (sb->s_blocksize_bits - 9);
err_out:
DBG_BUGON(err);
erofs_put_metabuf(&buf);
return err;
}
static int erofs_fill_inode(struct inode *inode)
{
struct erofs_inode *vi = EROFS_I(inode);
int err;
trace_erofs_fill_inode(inode);
/* read inode base data from disk */
err = erofs_read_inode(inode);
if (err)
return err;
/* setup the new inode */
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &erofs_generic_iops;
if (erofs_inode_is_data_compressed(vi->datalayout))
inode->i_fop = &generic_ro_fops;
else
inode->i_fop = &erofs_file_fops;
break;
case S_IFDIR:
inode->i_op = &erofs_dir_iops;
inode->i_fop = &erofs_dir_fops;
inode_nohighmem(inode);
break;
case S_IFLNK:
if (inode->i_link)
inode->i_op = &erofs_fast_symlink_iops;
else
inode->i_op = &erofs_symlink_iops;
inode_nohighmem(inode);
break;
case S_IFCHR:
case S_IFBLK:
case S_IFIFO:
case S_IFSOCK:
inode->i_op = &erofs_generic_iops;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
return 0;
default:
return -EFSCORRUPTED;
}
mapping_set_large_folios(inode->i_mapping);
if (erofs_inode_is_data_compressed(vi->datalayout)) {
#ifdef CONFIG_EROFS_FS_ZIP
DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,
erofs_info, inode->i_sb,
"EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
inode->i_mapping->a_ops = &z_erofs_aops;
#else
err = -EOPNOTSUPP;
#endif
} else {
inode->i_mapping->a_ops = &erofs_aops;
#ifdef CONFIG_EROFS_FS_ONDEMAND
if (erofs_is_fscache_mode(inode->i_sb))
inode->i_mapping->a_ops = &erofs_fscache_access_aops;
#endif
#ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb)))
inode->i_mapping->a_ops = &erofs_fileio_aops;
#endif
}
return err;
}
/*
* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
* so that it will fit.
*/
static ino_t erofs_squash_ino(erofs_nid_t nid)
{
ino_t ino = (ino_t)nid;
if (sizeof(ino_t) < sizeof(erofs_nid_t))
ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;
return ino;
}
static int erofs_iget5_eq(struct inode *inode, void *opaque)
{
return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;
}
static int erofs_iget5_set(struct inode *inode, void *opaque)
{
const erofs_nid_t nid = *(erofs_nid_t *)opaque;
inode->i_ino = erofs_squash_ino(nid);
EROFS_I(inode)->nid = nid;
return 0;
}
struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)
{
struct inode *inode;
inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,
erofs_iget5_set, &nid);
if (!inode)
return ERR_PTR(-ENOMEM);
if (inode->i_state & I_NEW) {
int err = erofs_fill_inode(inode);
if (err) {
iget_failed(inode);
return ERR_PTR(err);
}
unlock_new_inode(inode);
}
return inode;
}
int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
struct inode *const inode = d_inode(path->dentry);
bool compressed =
erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);
if (compressed)
stat->attributes |= STATX_ATTR_COMPRESSED;
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
STATX_ATTR_IMMUTABLE);
/*
* Return the DIO alignment restrictions if requested.
*
* In EROFS, STATX_DIOALIGN is not supported in ondemand mode and
* compressed files, so in these cases we report no DIO support.
*/
if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
stat->result_mask |= STATX_DIOALIGN;
if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {
stat->dio_mem_align =
bdev_logical_block_size(inode->i_sb->s_bdev);
stat->dio_offset_align = stat->dio_mem_align;
}
}
generic_fillattr(idmap, request_mask, inode, stat);
return 0;
}
const struct inode_operations erofs_generic_iops = {
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_inode_acl = erofs_get_acl,
.fiemap = erofs_fiemap,
};
const struct inode_operations erofs_symlink_iops = {
.get_link = page_get_link,
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_inode_acl = erofs_get_acl,
};
const struct inode_operations erofs_fast_symlink_iops = {
.get_link = simple_get_link,
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_inode_acl = erofs_get_acl,
};
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